Tube trimming and piercing machine



2 SHEETS-SHEET l w l ES Q 3 b3 hm WW a all! H. F. TEMPLE Jan. 22, 1952TUBE TRIMMING AND PIERCING MACHINE Filed March 2, 1950 Jan. 22, 1952 H.F. TEMPLE TUBE TRIMMING AND PIERCING MACHINE 2 SHEETS--SHEET 2 FiledMarch 2, 1950 INVEN TOR. Harold F Kemp/e AT ORNEY Patented Jan. 22, 1952TUBE TRIMMING AND PIERCING MACHINE Harold F. Temple, Elmont, N. Y.,assignor to Victor Industries Corporation, Brooklyn, N. Y., a

corporation of New York Application March 2, 1950, Serial No. 147,189 20Claims. (01. 164-11) This application is a continuation in part of myapplication for Can Trimming Machine and Method, Serial No. 585,169, nowabandoned.

The invention relates to trimming machines for operating upon smalldiameter thin metal cans or tubes open at one end and closed at theother and relates particularly to the means for holding the cans inplace during operation thereon and for dismounting them when finished,and for trimming, beading or otherwise shaping and piercing the cans atthe same time.

In trimming machines of the type mentioned, there are customarilyprovided a rotatable arbor or mandrel on which the can is mountedloosely and an oscillatory tool holder having a revoluble shaft.Difficulty has been experienced not only in holdin the work on themandrel in the exact position required for accurate operations thereon,but also in performing accurate trimming and other operations on thework such as to form an open end tube of an exact length within narrowlimits such as is necessary for example in radio tube shield cans,condenser cans and the like. Difficulty has also been experienced inremoving the scrap piece or waste material left from the trimming andpiercing operations, which removal has often been necessarily donemanually. Nor has been possible to pierce the end of the rotating can onthe mandrel while the trimming or shaping operations are performed.

This invention therefore contemplates the provision of means acting onthe closed end portion of a tubular work piece for holding andmaintaining the work in an exact predetermined position on a mandrel,said means including fluid pressure applying means and mechanicalpressureapplying means acting just before and while the work is engagedby the trimming and shaping tools, such engagement occurring at the samerelative point of each piece mounted in the machine.

The invention further contemplates the provision of means for piercingthe closed end of the rotating can while other operations such astrimming and beading, filleting or other shaping operations areperformed on the lateral surface of the can.

The invention further contemplates the provision of simple, inexpensivebut effective means for dismounting the can and any scrap materialresulting from the operations, thereby attaining a finished can trimmedto length, beaded or filleted or otherwise shaped if desired, and alsopierced if desired and dismounted in a single manual setup of the can onthe same mandrel of the same machine.

The invention further contemplates the provision of revoluble means foradequately holding the closed end of the can concentric with the mandreldurin the trimming and other operations which temporarily spring ordistort another part of the can into a position eccentric of themandrel.

The various objects of the invention will be clear from the descriptionwhich follows and from the drawings, in which Fig. 1 is a frontelvational view of part of the machine showing the mandrel and theholding and piercing means for the work partly in section and in dottedlines in the retracted positions thereof, and also showing the trimmintools in dotted lines in the retracted positions thereof.

Fig. 2 is a vertical sectional view of the mandrel and of the can asthey appear while the work hangs freely on the mandrel out of engagementwith the trimming and beading tools and the piercing punch.

Fig. 3 is a similar sectional view taken on the line 3--3 of Fig. 1,showing the can slightly and temporarily distorted by the revolvingtools.

Fig. 4 is a similar sectional view of the mandrel and of the finishedwork, showing the approximate position assumed by the latter and theclearance between the mandrel and the work when the work is blown offthe mandrel.

Fig. 5 is a top plan view, partly in section, of the means for actuatingthe moving parts and for timin the blasts, the frame of the machinebeing omitted.

Fig. 6 is a front elevational view of the same, partly in section.

Fig. '7 is a fragmentary front elevational view and vertical section ofthe work holding and piercing means in a modified form.

Fig. 8 is a side elevational view of the blowoff pipe surrounding themandrel.

Figs. 9-12 are front elevational views of some of the various cans ortubes which can. be produced on the machine by the use of suitablerevolving tools and, correspondingly shaped mandrels.

The typical machine to which the invention is applicable includes arevolving mandrel as l5 and an oscillatory and revoluble tool carryingarbor as I6 adapted to carry one or more revolving'tools toward and fromthe mandrel and to maintain the tools in contact with the work blank forone or more revolutions of the mandrel. By means of the presentinvention, it becomes possible to perform substantially simultaneously.

; a number of highly accurate operations in a single setup of the workon the mandrel and thereby to produce the required can accurately and inquantity on the same machine, and similarly to produce any one of anumber of differently shaped cans merely by changing the tools or thework mounting and hOldil'lg devices, or

both. 7

.As best seen in Figs. and 6, the work or mandrel" arbor I5 is rotatedby the shaft I? to which it is operatively connected in any well knownmanner, said shaft being rotated through i the gear l8 thereon whichmesheswith the 'gear I9 on the driven shaft 20. A suitable motor as 2|drives said shaft throughthe motor pulley 22, the belt 23 and thepulley- 26 on the'shaft 20'? To supply a timed blast for automaticallyejecting scrap resulting from theend piercing operation after the cycleof operations has been completed, the mandrel shaft IT has alongitudinalpass into the pipe 34 ontheothenside of the valve and thenceto enter the opening '25 Thetool arbor 18 is designedto hold, rotate andoscillate towardand from the mandrel, any number of suitable circulartools such as the trimming: tool 35 (Figs. 1 and 7), the grooving tool36- (Figs; 1- and '3 or thefilletformingtool 31- (Fig.- '7) withsuitable spacers-as SBztherebetween. While the-tools for shaping thevarious forms of be'ads of ;the cans-39, Biiand All of Figs.

10; ll and 12 are not shown, such: tools are well understood and neednot be describedindetail.

Themandrels |-5of --Fi g--.- 1 and-42=of Figefli are suitably shapedandi dimensioned to cooperate with the revolving tools 36; 31 or thelikento shape or cut-that partof the can or tube pressed therebetween ina well known manner; For. example, in Fig.- 10 the shaping operation".is the formation of the-bead -43, which is mainly convex outwardlybutwhich is bounded byoutwardly concaveedges. The mandrel in that casewould have a bead" bounded by -similar concave edges andofthe same crosssectional size and shape as that of the inner surface of the bead-LIrrFig. 1'1, thebeadfla is bounded by only one concaveedge portion andin Fig. l2, the bead43b hasn0 con-. cave edges; Shapesother than beadsmay obviously be formed as may-be found-necessary, and the tools andmandrel in thatcase; arershaped accordingly.

To oscillateand'rotate the toolshaft-lt; an oscillatory bifurcatedframeisprovided, said-frame being pivotcd on thedriven shaft 20 (Figs '5 and6')" and -having-one arm 44 supporting the shaft lteand another arm 45supporting the auxiliary sprocket shaft 45. The shaft 29 carries thesprocket wheel-4l while theshafts I hand 46 .carry the respectivesprocket wheels 48 and 49; Pass-:

ing aroundsaid wheels is thechain 53 whereby rotation of the shaft 20 rcauses" rotation: of the shaft It; An adiustab1erod 5'l issecured atoneend to the arm 45-ofthesprocket frame and at theother end is connectedto-an endiof the crank lever:52 pivoted to the frame; of the machine asat 53z The otherend part-of the crank lever is connected to the bar54-:havinga slot 55ntherein throughwhich:slotepasses the-cam shaft 29.Pro-.-v

jecting from the bar 54 is the pin 56 drawn into contact with the cam 51on the shaft 29 by the tension spring 58. Said spring is connected atone end to the crank lever 52 and at the other end to the frame of themachine as at 59, whereby the spring, when permitted to do so by the cam51, pullstheishaft lfiin ax counter clockwise direction as viewed inFig: 6 and**away--from the mandrel l5. Said cam is properly shaped tomove the pin 56 and..the bar 54 toward the left at the propertime-therebyto rotate the lever 52 in a clockwise direction, moving therod 5! toward the right-andirotating the frame and the parts carried-thereby in a clockwise direction to move the tool shaft- 5- toward themandrel.

To time the work blow-off blast through the V pipe 60, the cam" ti onthe cam shaft 29 operates the spr-ing-closed valve 62 interposed betweenthe pipe 60 and the air supply pipe 33. Said pipe 69 terminates at its;upper. end in a, loop;63 (Figs. 1, '7 andS) concentric-withandinslightly-spaced relation; to; and: around the mandrel shaft; H; The,loop isprovided with. a number of holes-54 unevenly spacedcircumferentially aroundv the loop-and inclined tothe axis of -themandrel and on the side ofzthe loop; nearer the revolving tools for thedischargeof-a,dismounting air blast along thermandrel l5 ori i2. Theholesefitare prefen ably-concentrated more closely toward one side andnearthe bottom-,of-theloopas best seen in Fig .v 8, because-thescrapa-nd the released work tend tor hang on the mandrel tangent theretoat a pointof'fthevertical center line of the mandrel owing to therotation of-,-the ;mandrel.in thedig rection of the arrow. of Fig. 8;Mostofthe holes- 64. are. therefore provided where. the. space 68.between theworkandthemandrelis greatest and wherethe greatest amount ofblast fluid istherefore required to perform thebloweoff operation. Theblast emerges from the holes 84in the form of-a hollow cone asshowngenerally by the. arrows of Figs. 1 and'l'hand applies dismountingpressure, in a direction. generally longitudinal of the mandrel as wellasaround the outside of the man,- drel, and the inner and outer.surfaces of the scrap piece '65 ofjFig; 1 or fidof Fig. 'land on thefinished'work 6120f Fig. 1 or 69, of Fig. '7.

The wor l tobe; trimmed and shaped is in the formof a tube blank as, 2,and is mounted on the, mandrel manually; To. permit" easy mounting andalso to' permit easy dismounting of the;.fi ni'shed can or tube' afterit has been bfeaded or grooved; the diameter of the mandrelismadesufficiently lessthan the diameter of the inside Offthfij tube; asis' well understood in the art, or in other words the tube-isconsiderably larger'than the mandrel. Consequently, the tube blankmerely hangs on the rotating mandrelin about the position shown in Fig;2 before it-is pressed intotrimming and" shaping position by the meansforholding the end portion of thetub'e or by the revolving; tools.However, means are provided" to assisttheoperator to mount the blank andto relieve theoperator ofth'enecessity formoving the blankall the :wayonto the mandrel: Itwill'be"understoodthat the l onger the operators handremains in contactwith the blank, the greater the danger of injury toher by her failure-to withdraw her; hand in time, or the slowerthespeed-of the machine to give her sufiicient' time for that-purpose.-

Saidmountingmeans'takes the-form of a-properly: timed blast acting: onthelclosed bottom--16 ofi the'tube asit-is released bytheroperator,theblast passing; through". their reciprocating.v centering, holding andpiercing mechanism 11 of Eig fl and 18 of Fig. 1 and through the pistonrod or pipe 8| to complete the mounting of the tube after it has beenpartially mounted by the operator, thereby giving the operatorsufficient time to withdraw herhand before the holding mechanism engagesthe end portion of the tube or the revolving tools engage the lateralsurface of the tube. Exact synchronization of the operation of the toolsbecomes unimportant when the mounting blast is used, since said blastpositions and holds the work properly against the end of the mandreluntil either the tools or the holding means come into operation. Thepassages for the blast through the holding means will be later describedin connection with the description of said means. The blast is operativewhen the tool shaft I6 is retracted from the mandrel as shown by thedotted lines of Fig. 1 and when the holding means is also retracted. Theblast is timed to operate alternately with the dismounting blast throughthe holes 64 of the pipe 63. For this purpose, the cam I2 mounted on thecam shaft 29 operates the valve I3 which is interposed between the airsupply pipe 33 and the pipe I4 leading to the pipe 8! through theflexible pipe I5.

The pipe 8I serves also as a piston rod, carrying at the end thereof thepiston I9 reciprocating in the cylinder 82 and urged away from themandrel by the spring 83. Air is supplied behind the pis ton at theproper time through the branch pipe 84 to force the piston, togetherwith the pipe BI and the holding and piercing parts carried thereby,toward the mandrel against the action of the spring 83.

In the form of the holding and piercing means shown in Fig. l, the punchholder 94 is revolubly secured to the end part of the pipe 8| as bymeans of the set screw 80, the inner end of which is inserted into andruns in the groove 9|] around the pipe. A second pipe as I 8Iscrewed tothe holder 94 as at I94 and arranged inside of the pipe 8| may serve ifdesired as an additional bearing for the latter. 'Io permit the blast topass out of the pipes BI and I8I, a central hole 85 is provided in thepunch holder and communicates with the radial holes 86 and 81 leading tothe circumferentially spaced holes I81 through which the blast emergesfrom the holder. In the extension 88 of the holder is mounted thesuitable punch 89 of such length that its operative end lies within thesleeve 9I at all times, the punch having the central blast passage I89therethrough communicating with the hole 85. At one end thereof, thesleeve is removably secured to the holder 94 as by the screw threadsI!!! whereby another similar sleeve may be substituted when the tubediameter is changed. At its free end, the sleeve is rounded, bevelled orflared properly to'guide'the end portion of the tube blank intoengagement with the inner cylindrical surface of the sleeve and tocenter said end portion accurately and concentrically around thecorresponding end of the mandrel I5, when the sleeve is 'moved to theposition shown in Fig. 1 in which it embraces the tube end portion andthe end sleeve around the punch through the holes I81 automaticallycompletes the mounting of the blank III on the mandrel I5, the mountinghaving been initiated manually. At the same time, the pipe 8| togetherwith the parts secured thereto move longitudinally toward the mandrelunder the air pressure on the piston 19. The closed end part of the tubeblank then enters the flared part of the, sleeve and is guided to aposition concentric with the mandrel, while the end wall 16 of the blankengages the button and moves said button into the sleeve against theaction of the spring 96, thereby pressing the end wall of the tubefirmly against the end surface of the mandrel and holding the blankfirmly on the mandrel. The air pressure on the piston and the blast maypersist during operation of the tools on the shaft I6. However, as theblank moves into the sleeve to the position of Fig. 1, the punch 89pierces the end wall of the blank in cooperation with the female die 91of the mandrel, to punch out a small disc and to form the desired holein the end of the blank. The tools 35 and 36 or 31 in the meantime havedescended toward the rotating mandrel, the tool 35 to trim the blank tolength, the tool 36 to indent or groove the blank or the tool 31 to formthe corner fillet as I02, Fig. 7. The closed end part of the blank beingheld concentrically of the mandrel, it is obvious that the pressure ofthe rotating tools upon the blank: to close the space I68, Fig. 4,between the unstressed blank and the mandrel, distorts the blankmomentarily as shown in Figs. Land 3 at the successive points where thetools apply such pressure. The distortion, however, is so slight and ofsuch short duration that the tube, even though thin, springs back to itsnormal shape as soon as it is released by the tools. Pressure of thetools on the work causes the work to rotate, as does the pressure of thebutton 95 on the blank. Rotation of the mandrel is thereby imparted notonly to the blank but also to the button, sleeve and punch, making itpossible to pierce a rotating blank while or just prior to the trimmingand shaping of the blank.

It has been hereinbefore explained that the mandrel is suitably shapedto cooperate with any selected revolving tools in the shaping andtrimming of the tube blank. For example, the trimming tool 35 cooperateswith the shoulder I35 of the mandrel to shear the blank to length. Thegroove I36 similarly cooperates with the grooving tool 36, but is soshaped and dimensioned as to avoid sticking of the work therein, therebyto per.-

. mit the tube to be readily blown off the mandrel.

Preferably therefore, the mandrel groove I36 is slightly deeper than thedepth of the groove to be formed in the blank or the depth of theprojecting part of the beading tool, so that the inside surface of thebottom wall of the groove in the blank is not quite in contact with theouter face of the annular groove in the mandrel. Similarly, the sidewalls of the beading tool converge somewhat inwardly, while the sideWalls of the groove I36 are parallel and in planes perpendicular to theaxis of the mandrel as shown in Fig. 1. When the work 61 is released bythe tools and the sleeve 9I, the blast through the pipe 60 and the holes64 thereof becomes effective to raise the work out of contact with themandrel sufliciently for the blast to perform its .dismounting function,the inner diameter of the groove in the work being slightly greater thanthe outer diameter of the mandrel as shown by the space I68 therebetweenin Fig. 4. It will be understood that the air blast through the punchhole t8?! and through the-hole [81 of the punchholder'iscut0'iT"'du-ring the-retraction of the sieeveso as'n'ot" to interfere withthedis mounting operation; which dis'mounts the scrap piece-as well a'sthe work:

ln-that formpf' the mandrel and of the support means for the closed"-end ofthatuheshownih Fig: '7; the punch (1 6 projects axially" from the.fi ee end of the mandrel 42- and cooperates-with the button I H topierceandto punch outa disc from the endof thetube'; the'punch-enteringj the nw 1 :32 inthe button: The blast' through the pipes 8 Pandl 8' serves-'toejectthe'scrap'or punch: ingzdepositedin the-hole- I l-2 6y- "the-punch. The remaining parts" of the holder Ti f being similar to'thosepfthe holderlfi: no further description thereof appears necessary:In thisform*of' the invention, themounting blast' through the pipesallthe way on 'themandrel because of' thednter' ferenee of the punch H0i However; the work" holder F5 "is effective to complete the-mountingof the'b'lank, to arrange the end of-the blanhin prop er-concentricrelation tothe endpart of the'man drel= and to punch" the hole in theendwall of the blankj ust before the revolving; tools engage the blank: Thebutton-= H F presses-the end-wall off the "blank" against" thefre'e 'endof the-mandrel 4'2"-during'the"shaping operations-on the blank;

b'ut' such shapingpperations follow" the-punching operatibn-on th-e-rotatingcworkso closely that" the punching and shaping operations may;be said*to take placesubstantiallysimultaneously: The pressure"- of theWork holder" on the end. of" the blank "causes' the button-"to mutateand also cause different 'sizesandshapespeculiarly designed-for s theformation of the -particularfinished 'tuber As shown in Fig:1*,themandrel leis-hollow and is screwed on" totheman'drel' shaft .l'Fby' the waist in'g screw threads! I51" A" female 'die 9T Xe'diin theend part of the mandrel cooperates' with. the punch 89" to ClJtTthE'small disci as 1'91 out ofgthe end Wall" 16 of the blank thereby toproduce the hole 116. Suitable radialholesllllinthe'mandrel receive thewa'stepunchings and .permitthemto drop-out of the mandrel whenthe scrappiece 65" andt'he'work are blown offthe mandrel; should the punchings- I91" fail to" drop out of the holes Ill-l; theblastthroughthe'opening Z Beffects the ej ection thereof;

It" will now be understood that the present in-. vention providesmeanseffective" to" complete the mounting of'atubulanblankonasmallertm'andrel afterthe mounting operation has'been'manually initiated, then to trim; shape and pierce. the blanksubstantially simultaneously whilethebla'nk r0; tates; the piereingbeing accomplishedb'y a'punch which is revolubly mounted, thatltheclosed end of the blank iscenter'ed concentrically of 1 the mandrelduringitheeperations on the blankgwhile' the other'part of the blank ispressed against the mandrer and -is consequent1y-*- arranged temporarily eccentrically with respect'thereto; that' sim' pie but adequatefluid pressure= applyihg means have-been provided todi'sinountthe'finished'worl as W811 as the'scrapresulting from the-operatiens; andthattl'ie'struct'ure' provided is well designed to meet allpracticalrequirementsz- While certain specific formsof theaihventionhave herein been shown anddescribed; various changeemay obviouslvbe"made-therein without" departing" from tlie spirif 0f' the-*inVentib1T-d finecl'in'theappended claimsi 12' In a tube trimming machine; arevoluhle mandrel constituting a' first" support means *fbna generally"cylindrical tube havingpne'closed en'd and'the otherend open; the tubeno'rma lly hang ing': eccentrically on the mandrel, arevoluble tool;means formoving thetooltoward and from the" mandrel" t6 press "the tubebetween the tool and the mandrel}, and means for holding? the closed?end portion of the tuhe' 'concentrically withthemandrelduring theoperation'of the; tool on thetube thereby temporarilyto" distort thetubeysaid holding: means comp'risin'gta ,sIeeve'a-r ranged" in axialalignmentwith the mandrel, means to reciprocate the sleevelongitudinally t'owardand' from the mandrel; theinner-di'anreter of thesleeve being Y greater" than the": outer diameter-0f the mandr'el;.$aid-sleeveireceivinggthe mandrel and" the closed end 1 portion of"thet'ube therein when the sleeve is nearest the mandreli a"springpressed rotatable button constituting a second support means, forthetube and mounted f0r"10ngitudiha1slidirig movement in" the sleeveintoa position in pressed contact With'the closed endiof thetubeto'press said endagainst theehd of the mandreland'fa;'revoluble-"mountmg for-the button and sleeve. 7

2. The" machineof" claim 1'; anpiercing" punch carried by one'ofthe-support: meansand. rotat= able therewith; the" other" of the?support means having a .centralholejtherein torreceivethe punch onthe"reciprocation of 'theisleeve: v

3": The" machine of"claim* I; the buttbnzhaving a central" holetherein,. and" a punch projecting from-thetmandrel and'arrangedtdenter'theihole inithe button on the' reciproeationiof;the: sleeve.

4; The machine oficlaim 1;. the pressure of", the button against'theLtube' aiding to rotate; the tube, the mandrel and" the, button eachhaving, an axially, arranged. hole therein, a punchccarriedlby androtatable withthe sleeve andi in axiallali'gn; ment with the hole. in.the..button,.,the punchten tering the hole inthecmandrel,onltheireeiproca tion of the sleeve therebytopiercewtheendliof the rotating'ftuber 5. The machine of claim. 1, the tool being atrimming, tool, the mandrel having a; trimmin shoulder, thereoncooperating with. the: tool v to trim a cylindrical. tubular scrap piecefrom. the open; end; part of l the. tube a. pipe loop; around theinnerendpart ofllthe. mandrel, saidloophavring' a plurality orIcircumferentially spacedublast discharge" holesvin the side wallvthereofg the axes of the holes: being inclined. to the. axis: bf;v themandrel, andz'me'ans for deliveringiatblast through theloop toblowthee-scrap piece .andI.thestubeofi the. mandrel onthe retraction of thesleeveand the to'oLaWayi-fromthe' mandrel; I

6? The machine of claim-1; 1,,thetook-beingv a trimming tool the.mandrel! having a trimming shoulder thereon cooperatingwith thetoolltoitrim a tubular-scrap. piece from the" tube,-, and. ahpipe looparound the mandrel and having circumferentially spaced apart blastdischarge openings therein shaped to deliver a hollow conical blastcircumferentially upon the scrap piece and the tube to dismount saidpiece and tube from the mandrel.

'7. In a tube trimming machine, a mandrel, means to rotate the mandrel,a trimming tool, means to swing the tool toward and from the mandrel,means to rotate the tool to trim off a scrap piece from the tube,tube-holding means to receive, embrace and support the end part of atube carried by and of greater diameter than the diameter of themandrel, said means holding the end part of the tube concentrically ofthe mandrel while the tool presses another part of the tube temporarilyagainst the mandrel and thereby arranges said another part of the tubeeccentrically f the mandrel and rotates the tube, means to reciprocatethe tube-holding means toward and from the mandrel, and meanssurrounding the mandrel to deliver a hollow conical blast around themandrel and thereby to dismount the scrap piece and the tube.

8. The machine of claim 7, and means associated with the tube-holdinmeans to punch a central hole in the end wall of the tube while the tubeis held by the tube-holding means.

9. The machine of claim 8, the tube-holding means including a sleeve anda spring-pressed perforated button slidably axially in the sleeve.

10. The machine of claim 7, and means for delivering a blast through thetube-holding means to assist in mounting a partly mounted tube on themandrel.

11. The machine of claim 10, and means associated with the tube-holdingmeans to pierce the end wall of the tube.

12. The machine of claim 7, the mandrel having a longitudinal holetherein communicating with a transverse hole therethrough and a punchcarried by and rotatable with the tube-holding means and depositing apunching from the tube into the longitudinal hole in the mandrel.

13. The machine of claim 12 and means for delivering a blast through thetube-holding means and the punch when the dismounting blast isinoperative.

14. In a tube trimming machine, a revoluble mandrel to enter and torotate a tube, means to rotate the mandrel, a die having a hole therer.

through and carried by the mandrel for rotation therewith, a sleevereciprocating toward and from the mandrel and receiving therein the endportion of the mandrel and the closed end portion of a tube mounted onthe mandrel when the sleeve is nearest the mandrel, means reciprocatingthe sleeve toward and from the mandrel, a perforated member slidable androtatably mounted within the sleeve and arranged to engage the closedend portion of the tube and to rotate therewith, a spring within thesleeve urging the member out of the sleeve, coacting stop shoulders onthe sleeve and member to limit the outward movement of the member, apiercing punch in the sleeve adapted to pass through the member and intothe hole of the die when said closed portion and said member slide intothe sleeve, and a revoluble mounting for the sleeve and the punch.

15. The machine of claim 14 and means for directing a blast through thesleeve and the member toward the mandrel.

16. The machine of claim 14, the sleeve bein in coaxial alignment withthe mandrel and of greater inner diameter than the outer diameter of themandrel and thereby holding the end portoward and from the mandrel,means to-rotate the tool, a trimming shoulder on the mandrel coplanarwith the tool and cooperating therewith to trim the other end portion ofthe tube and to press upon that part of the tube being trimmed to holdsaid part against the mandrel temporarily and in eccentric relation tothe mandrel.

17. In a tube trimming machine, a revoluble mandrel having a trimmingshoulder thereon and adapted to support a tube having a closed 'endandan open end, means to rotate the mandrel, a pipe arranged inlongitudinal spaced relation to the mandrel and in axial alignmenttherewith, means for directing a blast through the pipe toward themandrel and upon the closed end of a tube partly mounted on the mandrelto complete the mounting of the tube, revoluble means cooperating withthe shoulder to trim a ring of scrap off the open end of the tube and toleave the scrap ring on the mandrel, means to move the revoluble meanstoward and from the mandrel, means to rotate the revoluble means, asecond pipe in the form of a ring around the inner end portion of themandrel, the pipe ring having perforations in the wall thereof and beingclosed at the end thereof whereby a blast into the ring emerges throughthe perforations in annular form around the mandrel and moveslongitudinally around the outside of the mandrel and against thesurfaces of the scrap'r-ing and the tube to blow said scrap ring andtube oil the mandrel.

18. In a tube trimming machine, a revoluble trimming tool, a cylindricalmandrel adapted to enter a tube and having a part cooperating with thetool to trim one end of a tube, the mandrel having a longitudinalopening therethrough and a transverse opening communicating with thelongitudinal opening, means for oscillating the tool toward and from themandrel, means in longitudinal spaced relation to the mandrel fordirecting an air blast in one direction toward the mandrel, means fordirecting a second air blast in the opposite direction to encompass theoutside of the mandrel and also to pass through said openings, a pointedreciprocating piercing punch arranged coaxially of the mandrel andcooperating therewith to pierce the closed end of a tube during therotation of the tube by the mandrel and to deposit the scrap produced bythe punch in said longitudinal opening, yieldable means adjacent thepunch to exert pressure on said closed end during the operation of saidtool and punch, a housing for the punch and for said yieldable meansconfining said first-mentioned air blast to said one direction, andmeans for reciprocating the housing toward and from the mandrel.

19. In a tube trimming machine, a revoluble mandrel having alongitudinal opening therethrough and a transverse opening communicatingwith the longitudinal opening, punch-holding means reciprocating towardand from the mandrel for completing themounting of a cylindrical tubehaving a closed end on the mandrel and for holding the tube on andcausing the tube to rotate with the mandrel, said means comprising asleeve, a spring-pressed member having a longitudinal hole therethroughslidable in the sleeve and adapted to press upon the end of the tube anda piercing punch rotatably mounted within the sleeve, a die adjacent thetransverse opening 11 within .the mandrel and .coo.perating with .thegpunch to tpierce the :end of the -tube, 1 means for 'rdirecting a blastthrough :the .esleeve land vsaid ixmember .toward thermandrehmeansIonreciproeatingTthe punch-holdingemeans and the punch :teward andfrom-themandrel, a revolublemount- J g for the punch, sleeve and member,and means r-rdl-recting a' second blast through Ether-mandrel to eeiectthe punching lproduced hy the ,punch through the transverse opening.

20...-'In a tube trimming machine, a .revoluble :mandrel: adaptedtor-have1a tubev-havingc-a closed z-flat end mounte.d thereon and.rotated thereby, ..tne .mandrel having ca part .r-thereof reduced .-in.cdiameter-to receive: the trimmingtool hereinafter .mentioned, -a:sleeve c-reciprocatory toward and zlfromethe. mandrel, a spring-pressedmemberrsslidflame-within:thesleeve andrhavingva central open- ?ing:therein, tsaid amember gpressing upon "and irotating with the closedendof thel tube apunch a crotatably mounted mithincthesleeverand adaptedcoacting with the punch, a trimming tool ,coact- ,ing withandzoscillatory toward and from the vmandrel to-operate :upon the tube.substantially .simu1taneo.us1y withsthe operation-of therpunch andmeansctocoscillate thertool toward andirom ,theemandrel.

c HAROLD v12'. IEMBLE.

"REFERENCES "CITED The following references are ofltrecord win :the file'Offithis patent:

*UNITED STATES PATENTS

